From c1374155b0ff51f97bd3b6f4e45175f5fc57538c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Vladim=C3=ADr=20Vondru=C5=A1?= <mosra@centrum.cz>
Date: Thu, 23 Feb 2012 18:29:51 +0100
Subject: [PATCH] Math: function to compute product of all values in the
 vector.

Is this mathematic operation at all?
---
 src/Math/Test/VectorTest.cpp |  6 ++++++
 src/Math/Test/VectorTest.h   |  1 +
 src/Math/Vector.h            | 10 ++++++++++
 3 files changed, 17 insertions(+)

diff --git a/src/Math/Test/VectorTest.cpp b/src/Math/Test/VectorTest.cpp
index f5be2e503..7dff019d0 100644
--- a/src/Math/Test/VectorTest.cpp
+++ b/src/Math/Test/VectorTest.cpp
@@ -121,6 +121,12 @@ void VectorTest::normalized() {
     QVERIFY(Vector4(vec).normalized() == Vector4(normalized));
 }
 
+void VectorTest::product() {
+    float vec[] = { 1.0f, 2.0f, 3.0f };
+
+    QCOMPARE(Vector3(vec).product(), 6.0f);
+}
+
 void VectorTest::angle() {
     float a[] = { 2.0f, 3.0f, 4.0f };
     float b[] = { 1.0f, -2.0f, 3.0f };
diff --git a/src/Math/Test/VectorTest.h b/src/Math/Test/VectorTest.h
index ece0bbcca..7ec8c2edb 100644
--- a/src/Math/Test/VectorTest.h
+++ b/src/Math/Test/VectorTest.h
@@ -32,6 +32,7 @@ class VectorTest: public QObject {
         void addSubstract();
         void length();
         void normalized();
+        void product();
         void angle();
         void negative();
 
diff --git a/src/Math/Vector.h b/src/Math/Vector.h
index 2b9fb6c87..8111264fd 100644
--- a/src/Math/Vector.h
+++ b/src/Math/Vector.h
@@ -172,6 +172,16 @@ template<class T, size_t size> class Vector {
             return *this/length();
         }
 
+        /** @brief Product of values in the vector */
+        T product() const {
+            T out = 1;
+
+            for(size_t i = 0; i != size; ++i)
+                out *= at(i);
+
+            return out;
+        }
+
     private:
         T _data[size];
 };